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A method of measuring the optical emissivity of titanium and zirconium using eddy current heating is described. The specimen consisted of a cylinder of metal drilled with a small black-body hole, and its real and apparent temperatures were measured with an optical pyrometer at a mean wavelength of 0.652μ. The variation of emissivity with temperature was investigated and the precautions taken to avoid errors are described.
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F. J. Bradshaw (1950) studied this question.
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